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Sakar and al. Animal Movement.

4 December 2017 - 10:21am
This paper focuses on movement data from barnacle goose migration patterns. By using migration hotspots with periodicity and directionality from these hotspots they are able to establish the movement patterns of these geese. I’m not sure if geese have a need for privacy but if they do, attaching GPS trackers to them would definitely be […]

Analyzing Animal Movement Characteristics From Location Data (Sarkar et al., 2016)

4 December 2017 - 12:59am
This paper adopts Periodica algorithm by enhancing the hotspot detection, which accomplished through substituting Kernel Density Estimate (KDE) with Getis-Ord Gi*. The new method is applied in periodical behavior discovery in animal movement. It is a very typical case in spatial data mining for integrating spatial autocorrelation with traditional statistical analysis. As the author mentioned, […]

Thoughts on Toch et al

3 December 2017 - 7:50pm
This article gave me a much-needed injection of nuance into my views on privacy data. I found the concept of high and low entropy locations quite interesting, and how levels of comfort were correlated to these notions. By allowing the participants how to control their privacy settings based on time and location was quite very […]

Empirical Models of Privacy in Location Sharing (Toch et al, 2010)

3 December 2017 - 7:11pm
In this paper, the authors propose a model for privacy location sharing, and investigate the relationships between the sharing behaviors and location characteristics and tracking methods. During the modeling process, it is meaningful to introduce entropy and apply it in later statistical analysis. However, I think that the other settings may lead to bias when […]

On Sarkar et al. (2014) and movement data

3 December 2017 - 6:13pm
I thought Sarkar et al.’s “Analyzing Animal Movement Characteristics From Location Data” (2014) was super interesting, as I don’t have a very strong background in environment and I didn’t know about all of the statistical methods involved in understanding migratory patterns via GPS tracking. The visualizations were super interesting, like the Rose diagram to show […]

On Toch et al. (2010) and location-sharing

3 December 2017 - 4:45pm
This article was super interesting, as I didn’t know too much about the actual mechanics behind location sharing (ie. “Creating systems that enable users to control their privacy in location sharing is challenging” (p. 129)). Their ideas of identifying privacy preferences based on the locations that people go to was confusing (and was not really […]

Duckham and Kulik (2006) – Location privacy

3 December 2017 - 12:23am
In this chapter, Duckham and Kulik outline and compare four approaches to location privacy protection: regulation, privacy policies, anonymity, and obfuscation. The growing presence of locationally-aware devices (and applications) have increased both the richness of personal location data being gathered, but also the range of actors with access to it. While measures can be taken […]

Laube and Purves (2011) – Temporal granularity and cow trajectory data

2 December 2017 - 10:58pm
In this article, Laube and Purves explore the influence of temporal scale on the analysis of ecological movement data. In particular, they vary temporal granularity and record the effects on various movement parameters (speed, direction, periodicity) for a high temporal resolution cow trajectory dataset. Their results show that assessment of these parameters was inconsistent between scales, […]

Location Privacy and Location-Aware Computing, Duckham and Kulik (2006)

2 December 2017 - 6:59pm
Duckham and Kulik (2006) introduce the importance of privacy in location-aware computing, and present emergent themes in the proposed solutions to related concerns. In their section contextualizing privacy research, the authors present privacy and transparency as opposing virtues (p. 3). I’m curious about the distinction that would motivate the valuation of one over the other. […]

Movement GIS and Cows (Laube and Purves, 2011)

2 December 2017 - 5:27pm
What a cross-sub-disciplinary article! In their efforts to address temporal scale issues with regard to movement data, Laube and Purves (2011) nicely tie together many of the GIScience topics that we have covered in this course. This article reaffirms my view of movement GIS as a subdomain of temporal GIS. Broadly, temporal GIS looks to […]

Animal Movement Characteristics from Location Data, Sarkar et al. (2014)

2 December 2017 - 5:21pm
Sarkar et al. (2014) present an analytical framework for making inferences about animal movement patterns from locational information. The article was an insightful show-don’t-tell introduction to how movement research could be applied beyond the domain of GIScience. Also, I think this may be one of the first articles we’ve looked at with an explicitly ecological […]

Thoughts on Laube et al (2011)

1 December 2017 - 4:22pm
I have never before considered the complexity of measuring movement. A significant portion of the authors’ work seemed to be dealing with the issue of positional accuracy of a GPS transmitter. Since the data being collected is so simple in form (tuples containing id, x, y, timestamp), all subsequent calculations are determined by the changes […]

Privacy in Location Sharing (Toch et al. 2010)

1 December 2017 - 2:49pm
Prior to reading this article I felt quite comfortable in the privacy literature in preparation of my talk on VGI, however Toch et al.’s (2010) gave many new insights in the field of locational privacy. The first of these (and the most marking to me) was the concept of ‘locational entropy’, being the measure of […]

Thoughts on “How fast is a cow? Cross-Scale Analysis of Movement Data”

1 December 2017 - 1:47pm
It was interesting to see a direct link to Scale (the presentation I gave this week) in the very first paragraph of this paper. It just reaffirmed how scale is a central tenet of many different sub-fields of GIS, from uncertainty to VGI to movement data in this particular case. The authors enumerate the many […]

How fast is a cow? (Laube 2011): Moo-vement GIS

1 December 2017 - 1:20pm
Although I’ve never contemplated the speed at which a cow moves at, in this in depth paper I realize (as with the many subsets of GIS we’ve investigated in this course), that movement too has a very nuanced methodology to be done correctly. I found it refreshing to finally see genuine critique of GPS accuracy […]

“Empirical Models of Privacy in Location Sharing” (2010)

1 December 2017 - 11:08am
This was an interesting article dating from the early days of location-sharing mobile technology, before the widespread use of smartphones. Location sharing in Locaccino, the application used by participants, was based on time, location, and network rules. The authors concluded that these specific privacy settings allowed users to feel more comfortable with the locations they […]

Thoughts on “Empirical Models of Privacy in Location Sharing”

30 November 2017 - 10:52pm
I am really interested in ubiquitous computing and location-based technologies so I was looking forward to this paper. In describing their methodology and specifically the concept of “location entropy”, I would have liked a more operational definition of “diversity” of people visiting that space- whether they took into consideration economic, social, ethnic, gender differences and […]

How fast is a cow? (Laube and Purves, 2011)

30 November 2017 - 4:56pm
This paper  by Laube and Purges (2011) truly brings together so many of the concepts that we have explored in class over the last couple weeks: scale (spatial, temporal), temporal GIS and error and uncertainty. In fact, this article addresses Noe’s concerns from last week about temporal scale following his summer research work. What a […]

Thoughts on privacy: Duckham and Kulik (2006)

30 November 2017 - 12:37pm
I feel like the issue of privacy has come up in most classes this semester. It is such an important issue that is on most of our minds, most of the time as GIScientists. I find it interesting that the article by Duckham and Kulik was written in 2006, a couple years before everyone and […]

Thoughts on the nature of location privacy (Duckham and Kulik, 2006)

30 November 2017 - 10:42am
Dukham and Kulik’s (2006) article on location privacy and location-aware computing provides a comprehensive overview of issues regarding location privacy and the variety of strategies that can be used to protect this privacy. In particular, I found the authors’ delineation and descriptions of privacy protection strategies particularly fascinating. The first interesting question that this article […]